IndiaCakes.com — cake not delivered and money not refunded and when called for refund they are picking up the phone but not talking, they are cheating

Website:

www.indiacakes.com

I have ordered and paid for half kg cake which costs around 890rs (Incl delivery charge) and to be delivered on 19/05/2020, so indiacakes.com have accepted this order. But on 19/05/2020 indiacakes.com send me an e-mail asking for additional money as they were saying half cage is not available hence you should pay extra money for 1kg cake, so i chat with their executive on their website and i made it clear if you are able to deliver half kg cake its ok, but if not please cancel and refund the money and i made it clear to them am not going to pay an extra penny for this. So they didnt deliver the cake on 19/05/2020 and said it has been cancelled on phone. But now today when checked the refund status they are like saying we will issue a coupon for that so i said its not possible i want my money to refunded and i called on their customer care number ([protected]), they are picking up the phone but not talking. I felt like am cheated. Pls help.